Extracted from Pike v7.8 release 866 at 2016-11-06.
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Crypto
Crypto.Substitution

Methods
 decrypt()
 encrypt()
 filter()
 set_ACA_K1_key()
 set_ACA_K2_key()
 set_ACA_K3_key()
 set_ACA_K4_key()
 set_key()
 set_null_chars()
 set_rot_key()
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Method Crypto.Substitution()->set_ACA_K2_key()

Method set_ACA_K2_key

this_program set_ACA_K2_key(string key, void|int offset, void|array(string) alphabet)

Description

Sets the key according to ACA K2 key generation. The cryptogram alphabet is prepended with a keyword key that shifts the alphabet positions compared to the plaintext alphabet. The cryptogram alphabet is then reduced with the characters in the keyword. It is als optionally reotated offset number of steps.