30-04-2021

AB Cipher



Except explicit open source licence (indicated CC / Creative Commons / free), any 'Periodic Table Cipher' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Periodic Table Cipher' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher. Mar 19, 2021 Task. Implement a Playfair cipher for encryption and decryption. The user must be able to choose J = I or no Q in the alphabet. The output of the encrypted and decrypted message must be in capitalized digraphs, separated by spaces.

Number to Letter A1Z26 Converter

Letter to Number A1Z26 Encoder

Calculate a word's value

Answers to Questions (FAQ)

How to encrypt using Letter-to-Number/A1Z26 cipher?

A1Z26 encryption requires to count the positions/ranks of letters in the alphabet. If it is the Latin alphabet of 26 characters here is the correspondence table letter ↔ number/value:

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567891011121314151617181920212223242526

Replace each letter with its position in the alphabet (A = 1, B = 2, ... Z = 26)

Example:DCODE is encrypted 4-3-15-4-5 by alphanumeric substitution

Often the space character is also encoded with the number 0

How to decrypt Number-to-Letter cipher?

Decryption requires taking each number and replace it with the letter of same position in the alphabet: 1 = A, 2 = B, ... 26 = Z

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567891011121314151617181920212223242526

Example:1.12.16.8.1.2.5.20 gives ALPHABET

How to recognize Letter-to-Number ciphertext?

The crypted message is made of numbers between 1 and 26, sometimes the number 0 is used to code a space.

The digit 5 for E is supposed to appear regularly for an english text.

This encryption is sometimes called alphanumeric code.

What are the variants of the Letter-to-Number cipher?

Shift of numbers: the alphabet can start with A = 0 or A = 1, but also A = 65 or A = 97 (ASCII code).

Generator

Use of a supplementary character for space (usually 0 or 27)

Use of leading zeros to be able to concatenate numbers AB = 0102, else AB = 12 and 12 = L.

Use of a custom alphabet, or reversed alphabet (A=26, Z=1)

Use of modulo 26 in order to get 1=A,2=B,...26=Z then 27=A, 28=B etc.

Source code

dCode retains ownership of the online 'Letter Number (A1Z26) A=1, B=2, C=3' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Letter Number (A1Z26) A=1, B=2, C=3' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Letter Number (A1Z26) A=1, B=2, C=3' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Letter Number (A1Z26) A=1, B=2, C=3' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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Ab Cipher Block

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NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Ab Cipher Block

Options

Ab Cipher Generator

-A auth-username:password
Supply BASIC Authentication credentials to the server. The username and password are separated by a single : and sent on the wire base64 encoded. The string is sent regardless of whether the server needs it (i.e., has sent an 401 authentication needed).
-b windowsize
Size of TCP send/receive buffer, in bytes.
-B local-address
Address to bind to when making outgoing connections.
-c concurrency
Number of multiple requests to perform at a time. Default is one request at a time.
-C cookie-name=value
Add a Cookie: line to the request. The argument is typically in the form of a name=value pair. This field is repeatable.
-d
Do not display the 'percentage served within XX [ms] table'. (legacy support).
-e csv-file
Write a Comma separated value (CSV) file which contains for each percentage (from 1% to 100%) the time (in milliseconds) it took to serve that percentage of the requests. This is usually more useful than the 'gnuplot' file; as the results are already 'binned'.
-E client-certificate-file
When connecting to an SSL website, use the provided client certificate in PEM format to authenticate with the server. The file is expected to contain the client certificate, followed by intermediate certificates, followed by the private key. Available in 2.4.36 and later.
-f protocol
Specify SSL/TLS protocol (SSL2, SSL3, TLS1, TLS1.1, TLS1.2, or ALL). TLS1.1 and TLS1.2 support available in 2.4.4 and later.
-g gnuplot-file
Write all measured values out as a 'gnuplot' or TSV (Tab separate values) file. This file can easily be imported into packages like Gnuplot, IDL, Mathematica, Igor or even Excel. The labels are on the first line of the file.
-h
Display usage information.
-H custom-header
Append extra headers to the request. The argument is typically in the form of a valid header line, containing a colon-separated field-value pair (i.e., 'Accept-Encoding: zip/zop;8bit').
-i
Do HEAD requests instead of GET.
-k
Enable the HTTP KeepAlive feature, i.e., perform multiple requests within one HTTP session. Default is no KeepAlive.
-l
Do not report errors if the length of the responses is not constant. This can be useful for dynamic pages. Available in 2.4.7 and later.
-m HTTP-method
Custom HTTP method for the requests. Available in 2.4.10 and later.
-n requests
Number of requests to perform for the benchmarking session. The default is to just perform a single request which usually leads to non-representative benchmarking results.
-p POST-file
File containing data to POST. Remember to also set -T.
-P proxy-auth-username:password
Supply BASIC Authentication credentials to a proxy en-route. The username and password are separated by a single : and sent on the wire base64 encoded. The string is sent regardless of whether the proxy needs it (i.e., has sent an 407 proxy authentication needed).
-q
When processing more than 150 requests, ab outputs a progress count on stderr every 10% or 100 requests or so. The -q flag will suppress these messages.
-r
Don't exit on socket receive errors.
-s timeout
Maximum number of seconds to wait before the socket times out. Default is 30 seconds. Available in 2.4.4 and later.
-S
Do not display the median and standard deviation values, nor display the warning/error messages when the average and median are more than one or two times the standard deviation apart. And default to the min/avg/max values. (legacy support).
-t timelimit
Maximum number of seconds to spend for benchmarking. This implies a -n 50000 internally. Use this to benchmark the server within a fixed total amount of time. Per default there is no timelimit.
-T content-type
Content-type header to use for POST/PUT data, eg. application/x-www-form-urlencoded. Default is text/plain.
-u PUT-file
File containing data to PUT. Remember to also set -T.
-v verbosity
Set verbosity level - 4 and above prints information on headers, 3 and above prints response codes (404, 200, etc.), 2 and above prints warnings and info.
-V
Display version number and exit.
-w
Print out results in HTML tables. Default table is two columns wide, with a white background.
-x <table>-attributes
String to use as attributes for <table>. Attributes are inserted <table here >.
-X proxy[:port]
Use a proxy server for the requests.
-y <tr>-attributes
String to use as attributes for <tr>.
-z <td>-attributes
String to use as attributes for <td>.
-Z ciphersuite
Specify SSL/TLS cipher suite (See openssl ciphers)