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Article 178. Using fictitious name and concealing true name. - The penalty of arresto mayor and a fine not to exceed One hundred thousand pesos (P100,000) shall be imposed upon any person who shall publicly use a fictitious name for the purpose of concealing a crime, evading the execution of a judgment or causing damage.

Any person who conceals his true name and other personal circumstances shall be punished by arresto menor or a fine not to exceed Forty thousand pesos (P40,000).

ELEMENTS OF USING FICTITIOUS NAME:
1. That the offender uses a name other than his real name;
2. That he uses that fictitious name publicly;
3. That the purpose of the offender is –
a. To conceal a crime,
b. To evade the execution of a judgment, or
c. To cause damage to the public interest.
Ex. Signing a fictitious name for a passport

ELEMENTS OF CONCEALING TRUE NAME:
1. That the offender conceals –
a. his true name, and
b. all other personal circumstances; and
2. That the purpose is only to conceal his identity.

Related Article: Anti-Alias Law

using fictitious name and concealing true name